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Hi
I have a Saab 9000CSE, 1993 LPT B202 engine ECU type LH2.4. I keep getting this intermittent fault where the check engine light comes on. This is/are my problem(s).
When the check engine light comes on the behaviour of the car is that it does not want to smoothly accelerate or even rev from standstill. If while driving with this fault you lift your foot off the accelerator the idle will not hold and the engine shuts down. When I start from standstill it holds idle, I accelerate it and it does not want to smoothly accelerate.It difficult to explain the symptom but Its like a misfire but very minor misfire. Now this tends to happen every few months. I have changed dump valve, idle control valve, Lambda sensor, throttle pot and NTC and still it keeps on coming back.
This is what I do to get going.
When the check engine light comes on. I wait until the check engine light begins the flash at me on the dashboard at this point the code flashes 6 times. This is the Lambda sensor. I then erase the codes by disconnecting the ECU for 5-10 minutes and also replace the lambda sensor. IT works fine for 3-4 months then again it starts with the same symptoms. At this point i replace the lambda with the original one that i took off and reset the codes again it works fine for a couple of months. So i think theres something wrong with the lambda probe wiring and I check all the wiring for all sensors except DI. I even get the ECU checked no fault found. So now I am out of ideas.
Now last night I got stuck on the road with the same problem i then tried to do the same; Replace lambda this time its a brand new sensor and reset the codes. This time it ran for 30 minutes and same symptoms, loss of power , engine shut down. So the recovery guy did a few tests like disconnec the Idle control valve wiring and the engine started to run smoothly but at about 1500 rev/;min. He also revved the engine to see if it might be a blown turbo no smoke except at very high revs. He thought the turbo might have its fins touching the inner casing of the turbo causing an imbalance in the shaft therefore the lambda sensor keeps shwoingas fault up since there is not enough air going past the exhaust. Sound a bit way out thinking but at this point I am open to any suggestions.
posted by 213.52.20...
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